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emissions mot problem?

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Old May 6, 2008 | 01:52 PM
  #1  
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From: warrington
Default emissions mot problem?

got an import impreza sti which failed its mot on emissions

at high idle

c/o was 2.5%
passed on hydrocarbons and lamda was .096.

at tickover c/o was 1.99%

the car had been decatted,so i have refitted a cat into the exhaust system and took it back for retest

at high idle

c/o is 1.99%
hydrocarbons still ok and lamda ok

at tickover
c/o is now 0.51%


he has still failed it as the c/o is too high.

was going to change the lamda sensor,or should i check anywhere else.

it is fairly heavy on fuel,could a remap sort it out?
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Old May 6, 2008 | 04:43 PM
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From: warrington
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apparently coolant sensors fail a lot.could be the problem.
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Old May 6, 2008 | 06:47 PM
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what year of subaru is it ?
because any vehicle imported before 1996 i think is the year , does not need a cat test
it only has have a co reading below 3 1/2 % on tick over
yes coolant sensors do go on subaru's
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Old May 6, 2008 | 06:52 PM
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Originally Posted by biscuittin
what year of subaru is it ?
because any vehicle imported before 1996 i think is the year , does not need a cat test
it only has have a co reading below 3 1/2 % on tick over
yes coolant sensors do go on subaru's
its a 97 car.
just done a code read and it showing airflowmeter. engine man light isnt on though or anything.
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Old May 6, 2008 | 06:56 PM
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From: Stevenage, Herts
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AFM is also common....
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Old May 6, 2008 | 07:02 PM
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i hate this car!
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